This is a panel mount for rectangular meters. You can find these cheaply from the usual sources like AliExpress and eBay.

Assembly Notes

1. Print the base and the mount
2. Calibrate the meter by adjusting the potentiometers on the back while you wait on it to print
3. Press the meter into the mount
4. Attach the connectors that have the wires on them
5. Put drops of superglue into the base
6. Slide the mount into the base
7. Wait on the superglue to dry
8. Mount the meter wherever you want

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panel_mount_meter_base.stl

panel_mount_meter_mount.stl